Observation 129779: Deconica (W.G. Sm.) P. Karst.

When: 2013-03-02

Collection location: Port Ludlow, Washington, USA [Click for map]

Who: Caleb Brown (Caleb Brown)

No specimen available

Growing in a 3 year old clear cut.
Psilocybe pelliculosa was found there earlier in the fall.
Conifer debris
Smelling farinaceous
Microscopy to follow.


4 spored basidia
cheilocystidia 800x
cheilocystidia 2000x
cheilocystidia 800x
cheilocystidia 2000x
pleurocystidia 800x
spores 800x mango shaped

Proposed Names

-31% (2)
Recognized by sight
31% (2)
Used references: The Genus Psilocybe pages 189, 181 and 153
Based on microscopic features: Cheilocystidia 40 – 60 × 7 – 8, subventricose to subcylindric, spores subrhomboid. The spores are too large for this species.

Please login to propose your own names and vote on existing names.

Eye3 = Observer’s choice
Eyes3 = Current consensus


Add Comment
By: Caleb Brown (Caleb Brown)
2013-03-03 02:55:16 CST (-0500)

Ill save the few specimens i have in my herbarium.
I thought the spores were in the relative range for that species. guess not.. so really this is pretty much undescribed. Sweet i wanna name it. haha

By: Alan Rockefeller (Alan Rockefeller)
2013-03-03 02:49:32 CST (-0500)

I started with the key in The Genus Psilocybe page 78, and it lead to section Psilocybe due to the hyaline cystidia, subrhomboid spores and lack of blue staining.

Using the key to section Psilocybe on page 153, no annulus and one type of cheilocystidia leads to 3. The cheilocystidia is not lageniform so 4. The spores ar too large for P. physaloides so we go to step 5. The cheilocystidia is larger than either choice in 5, so we have an undescribed species!

Or maybe the cheilocystidia really is lageniform and we were supposed to take choice 6 at step 3!

In 6 there is Psilocybe rhomboidospora, but that has much smaller spores than this collection.

Since the cheilocystidia is longer than 40 – 45 micrometers, we again end up with an undescribed species.

Yes, very interesting
By: Alan Rockefeller (Alan Rockefeller)
2013-03-03 02:37:06 CST (-0500)

It’s the first observation of this species on MO. You should save the collection and send parts of it to people who like to work on Deconica.

Matches the description of D. rhomboidospora i found
By: Caleb Brown (Caleb Brown)
2013-03-03 01:41:09 CST (-0500)

Pileus ovoid to convex, gregarious to subcespitose, 0.5-I cm.
broad; surface dry, smooth, not striate, ochraceous to clay-colored,
adorned on and near the margin with whitish flocci; context ochra-
ceous, with slightly mealy taste and no characteristic odor; lamellae
adnate and decurrent, about 2 mm. broad, becoming chestnut-
colored with whitish, dentate edges; spores ovoid to subrhomboid,
smooth, purplish-brown, 5-7 × 4-5 ,; stipe flexuous, hollow, chest-
nut-colored within, clay-colored and whitish-fibrillose without, 2-3
cm. long, 2 mm. thick; veil evident when young, white, soon
TYPE LOCALITY: Ithaca, New York.
HABITAT: On leaves and decayed wood on the ground.
DISTRIBUTION: Known only from the type locality.
The type specimens, which I have not seen, were found by Jack-
son on June 5, I904. According to Atkinson, it is near D., nuci-
seda Fries.

Sounds like i found something interesting, its a beautiful species.

I think you are right,
By: Caleb Brown (Caleb Brown)
2013-03-03 01:35:43 CST (-0500)

thats why i only took one pic, wanted to see the community opinion before i delved in more.

I think your pleurocystidia might be basidioles
By: Alan Rockefeller (Alan Rockefeller)
2013-03-03 01:27:09 CST (-0500)
spore stats are on the bottom, just a few measured but these showed the average of the collection
By: Caleb Brown (Caleb Brown)
2013-03-03 01:18:21 CST (-0500)

Pleurocystidia was abundant, thats all i can really say i didnt measure them, wasnt too sure if they were actually pleurocystidia and not basidioles, sure was a lot of them though.

Spore stats?
By: Alan Rockefeller (Alan Rockefeller)
2013-03-03 01:14:23 CST (-0500)

Pleurocystidia stats?

Created: 2013-03-02 21:39:29 CST (-0500)
Last modified: 2013-03-03 09:31:35 CST (-0500)
Viewed: 109 times, last viewed: 2018-03-08 17:01:26 CST (-0500)
Show Log